Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca4f25bfa06cc5c…

MALICIOUS

PDF

33.5 KB Created: 2020-09-01 01:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b3318ed5cbdebb03f7fa6e9c16aac1f SHA-1: b14105721859230d5307460cc84ba08e3177ef85 SHA-256: fca4f25bfa06cc5cd4911c28f188b6af1b85342fb8c523f1256176622b937251
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=hm+duvet+size+guide'. This URL is embedded within the document body, disguised as a 'Hm duvet size guide'. The file also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on 'static.usrfiles.com'. The primary attack vector appears to be social engineering, tricking users into clicking the malicious link which likely leads to further malicious content.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=hm+duvet+size+guide
    • https://static.usrfiles.com/ugd/b8c837_a80bb959ef0b4f749cae6bab4368bd40.pdf
    • https://static.usrfiles.com/ugd/ec0c41_03755c49aa8c4870ad5f4f0b9c373be6.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa60f998f3ca46a0a3a5118adb8edc6e.pdf
    • https://static.usrfiles.com/ugd/b58d21_d526a2d3f5ec42ecb4a4a6415370e041.pdf
    • https://cdn.shopify.com/s/files/1/0432/0935/9517/files/86030083546.pdf
    • https://cdn.shopify.com/s/files/1/0441/1473/9352/files/domib.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/39342939177.pdf
    • https://cdn.shopify.com/s/files/1/0438/3696/5029/files/detail_filter_in_cognos_report_studio.pdf
    • https://cdn.shopify.com/s/files/1/0430/6491/8165/files/wuxafolubaruwelenem.pdf
    • https://cdn.shopify.com/s/files/1/0466/4246/2885/files/89351207468.pdf
    • https://static.usrfiles.com/ugd/b8c837_34660902ac7545cfbb8a3f9c8db5ca92.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e1279d65a5043e0b0f3c7dd1854f029.pdf
    • https://static.usrfiles.com/ugd/cafc24_efbbec95ea6e4b76a88d0e673e27fe62.pdf
    • https://static.usrfiles.com/ugd/b8c837_a357a50928244d5bb6def5c10414f7e1.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000474f.bin
fc69d33aeca98b8eb77448aac54b38ff4594c42fdf6ea55b6f7b340bb487e993		 pdf-font-stream PDF embedded font (sfnt) at offset 0x474F 4880 bytes
font_01_sfnt_off000057e5.bin
52b404147fea00025403fdfee54663a1fbefb6e7db1479d09d15cb25ab072c0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57E5 9828 bytes

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